Final answer:
B) Notify the healthcare provider of the pulse rate. The nurse should notify the healthcare provider of the pulse rate first.
Step-by-step explanation:
The nurse should take action B) Notify the healthcare provider of the pulse rate first. Digoxin is a medication that is commonly used to treat heart conditions, and it has the potential to affect the heart rate. The apical pulse rate of 76 bpm is lower than the expected range for a 2-month-old infant, so it is important to notify the healthcare provider to ensure the safety and well-being of the infant.